Method for improving heavy-load wheel rail wear-resistant performance by laser cladding cobalt alloy coating

A laser cladding, cobalt alloy technology, applied in the direction of metal material coating process, coating, etc., can solve the problems of crack porosity, uneven structure of cladding layer, wear resistance to be improved, etc., to improve wear resistance. , the effect of reducing the coefficient of friction

Inactive Publication Date: 2017-08-29
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when Fe-based powder is used as cladding material, due to the rapid melting and solidification speed of Fe-based powder material during laser cladding, it will lead to uneven structure in the cladding layer, prone to cracks and large porosity, resulting in its Abrasion resistance needs to be improved

Method used

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  • Method for improving heavy-load wheel rail wear-resistant performance by laser cladding cobalt alloy coating
  • Method for improving heavy-load wheel rail wear-resistant performance by laser cladding cobalt alloy coating

Examples

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Embodiment 1

[0017] A method for improving the wear resistance of heavy-duty wheel rails by laser cladding cobalt alloy coatings, the method is:

[0018] Utilize the laser to clad the cobalt alloy powder on the heavy-duty wheel rim surface or the gauge angle of the heavy-duty rail (that is, the inner surface of the rail head facing the center of the track); the weight percentage content of the cobalt alloy powder is: 1.1% C, 1.0% Si, 1.5% Fe, 28.5% Cr, 1.5% Ni, 4.4% W, and the balance is Co. The diameter of the cobalt alloy powder was 100 μm.

[0019] In this example, the specific method of cladding cobalt alloy powder on the surface of the heavy-duty wheel rim or the gauge angle of the heavy-duty rail by using a laser is: the laser is a multi-mode cross-flow CO 2 Laser adopts multi-pass cladding method, the width of each cladding is 8mm, and the depth is 1.0mm; the overlap rate is 30%, and the energy density of the laser beam is 200W / mm 2 , the distance from the laser beam exit of the l...

Embodiment 2

[0025] A method for improving the wear resistance of heavy-duty wheel rails by laser cladding cobalt alloy coatings, the method is:

[0026] Cobalt alloy powder is clad on the surface of the heavy-duty wheel rim or the gauge angle of the heavy-duty rail by using a laser; the weight percentage content of the cobalt alloy powder is: 1.1% C, 1.0% Si, 1.5% Fe , 28.5% Cr, 1.5% Ni, 4.4% W, and the balance being Co. The diameter of the cobalt alloy powder was 50 μm.

[0027] In this example, the specific method of cladding cobalt alloy powder on the surface of the heavy-duty wheel rim or the gauge angle of the heavy-duty rail by using a laser is: the laser is a multi-mode cross-flow CO 2 Laser adopts multi-pass cladding method, each cladding width is 6mm and depth is 1.2mm; the overlap rate is 30%, and the energy density of the laser beam is 200W / mm 2 , the distance from the laser beam exit of the laser to the heavy-duty wheel rim surface or the gauge angle of the heavy-duty rail i...

Embodiment 3

[0029] A method for improving the wear resistance of heavy-duty wheel rails by laser cladding cobalt alloy coatings, the method is:

[0030] Cobalt alloy powder is clad on the surface of the heavy-duty wheel rim or the gauge angle of the heavy-duty rail by using a laser; the weight percentage content of the cobalt alloy powder is: 1.1% C, 1.0% Si, 1.5% Fe , 28.5% Cr, 1.5% Ni, 4.4% W, and the balance being Co. The diameter of the cobalt alloy powder was 150 μm.

[0031] In this example, the specific method of cladding cobalt alloy powder on the surface of the heavy-duty wheel rim or the gauge angle of the heavy-duty rail by using a laser is: the laser is a multi-mode cross-flow CO 2 Laser adopts multi-pass cladding method, each cladding width is 10mm and depth is 0.8mm; the overlap rate is 30%, and the energy density of the laser beam is 200W / mm 2 , the distance from the laser beam exit of the laser to the heavy-duty wheel rim surface or the gauge angle of the heavy-duty rail...

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Abstract

The invention discloses a method for reducing heavy-load wheel rim abrasion and steel rail lateral abrasion by a laser cladding cobalt alloy coating. The manufacturing method comprises the step of coating cobalt alloy powder onto the surface of a wheel rail by a laser, wherein the cobalt alloy powder is prepared from the following ingredients in percentage by weight: 1.1 percent of C, 1.0 percent of Si, 1.5 percent of Fe, 28.5 percent of Cr, 1.5 percent of Ni, 4.4 percent of W and the balance Co. A heavy load wheel rail treated by the method has the advantages of high wear-resistant performance, low friction coefficient and long service life.

Description

technical field [0001] The invention relates to a method for improving the wear resistance of heavy-duty wheel and rail by laser cladding cobalt alloy coating. method. Background technique [0002] In order to ensure the safe operation of the railway system, the maximum wear depth of heavy-duty wheels and heavy-duty rails with an axle load of more than 25 tons must be controlled within 35mm and 13mm respectively. Under heavy-duty working conditions, the wheel rim and the side of the rail wear a lot, and the wear of these local areas is too fast, resulting in a short service life of the heavy-duty wheel and heavy-duty rail (heavy-duty wheel-rail). Laser cladding technology has broad application prospects in strengthening the surface of metal materials and improving wear resistance. Due to the low cost and good wear resistance of Fe-based powder materials, and similar composition to common carbon steel materials, cladding Fe-based powders on the surface of rails can effectiv...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C19/07
CPCC23C24/106C22C19/07
Inventor 王文健郭火明赵相吉刘启跃曹熙郭俊周仲荣
Owner SOUTHWEST JIAOTONG UNIV
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